Nuclear and chloroplast microsatellites show multiple introductions in the worldwide invasion history of common ragweed, Ambrosia artemisiifolia

Gaudeul, Myriam and Giraud, Tatiana and Kiss, Levente and Shykoff, Jacqui A. (2011) Nuclear and chloroplast microsatellites show multiple introductions in the worldwide invasion history of common ragweed, Ambrosia artemisiifolia. PLoS One, 6 (3). ISSN 1544-9173

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Abstract

Background: Ambrosia artemisiifolia is a North American native that has become one of the most problematic invasive plants in Europe and Asia. We studied its worldwide population genetic structure, using both nuclear and chloroplast microsatellite markers and an unprecedented large population sampling. Our goals were (i) to identify the sources of the invasive populations; (ii) to assess whether all invasive populations were founded by multiple introductions, as previously found in France; (iii) to examine how the introductions have affected the amount and structure of genetic variation in Europe; (iv) to document how the colonization of Europe proceeded; (v) to check whether populations exhibit significant heterozygote deficiencies, as previously observed. Principal Findings: We found evidence for multiple introductions of A. artemisiifolia, within regions but also within populations in most parts of its invasive range, leading to high levels of diversity. In Europe, introductions probably stem from two different regions of the native area: populations established in Central Europe appear to have originated from eastern North America, and Eastern European populations from more western North America. This may result from differential commercial exchanges between these geographic regions. Our results indicate that the expansion in Europe mostly occurred through long-distance dispersal, explaining the absence of isolation by distance and the weak influence of geography on the genetic structure in this area in contrast to the native range. Last, we detected significant heterozygote deficiencies in most populations. This may be explained by partial selfing, biparental inbreeding and/or a Wahlund effect and further investigation is warranted. Conclusions: This insight into the sources and pathways of common ragweed expansion may help to better understand its invasion success and provides baseline data for future studies on the evolutionary processes involved during range expansion in novel environments.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to Published version allowed due to publisher copyright policy.
Faculty / Department / School: No Faculty
Date Deposited: 29 May 2017 02:11
Last Modified: 29 May 2017 02:11
Uncontrolled Keywords: cell nucleus; chloroplast; controlled study; Eastern Europe; Europe; France; genetic isolation by distance; genetic variability; geography; heterozygote; inbreeding; inheritance; microsatellite marker; mutation rate; nonhuman; North America; plant evolution; population dispersal; population dynamics; ragweed; sampling; selfing; species introduction; species invasion; Bayes theorem; cell nucleus; chloroplast; cluster analysis; gene locus; genetics; haplotype; international cooperation; introduced species; population genetics; principal component analysis; haplotypes; internationality; introduced species; microsatellite repeats; principal component analysis
Fields of Research : 06 Biological Sciences > 0602 Ecology > 060299 Ecology not elsewhere classified
06 Biological Sciences > 0607 Plant Biology > 060799 Plant Biology not elsewhere classified
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970106 Expanding Knowledge in the Biological Sciences
Identification Number or DOI: 10.1371/journal.pone.0017658
URI: http://eprints.usq.edu.au/id/eprint/31895

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